Battle.Net and access to Diablo III and World of Warcraft is being blocked by Iran's…
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Because the US has imposed trade restrictions and economic sanctions on the Islamic Republic, most American companies aren't allowed to do business in the country. By selling games and subscriptions to Iranian residents online, Blizzard had been doing business in Iran, and apparently that had to stop.

What we can tell you is that United States trade restrictions and economic sanction laws prohibit Blizzard from doing business with residents of certain nations, including Iran. Several of you have seen and cited the text in the Terms of Use which relates to these government-imposed sanctions. This week, Blizzard tightened up its procedures to ensure compliance with these laws, and players connecting from the affected nations are restricted from access to Blizzard games and services.

This also prevents us from providing any refunds, credits, transfers, or other service options to accounts in these countries. We apologize for any inconvenience this causes and will happily lift these restrictions as soon as US law allows.